<script lang="ts" setup name="GoodsImage">
import { computed, ref } from 'vue';
import { useMouseInElement } from '@vueuse/core'
defineProps<{
  images: string[]
}>()
// 默认高亮的下标
const active = ref(0)
const target = ref(null)
const { isOutside, elementX, elementY } = useMouseInElement(target)
// console.log(isOutside, elementX, elementY);

const position = computed(() => {
  let x = elementX.value - 100 // 100 - 指的就是自身的一半
  let y = elementY.value - 100 // 100 - 指的就是自身的一半
  // 控制遮罩层左右移动的边界阈值
  if (x <= 0) x = 0
  if (x >= 200) x = 200
  if (y <= 0 ) y = 0 
  if (y>= 200) y = 200
  // console.log('------x------', x);
  return {
    x, y
  }
})

</script>
<template>
  <div class="goods-image">
    <!--  定位在右侧的容器, 背景图片是一张大图 -->
    <div 
       class="large"
       v-show="!isOutside"
       :style="[{ 
                backgroundImage: `url(${images[active]})`,
                backgroundPosition: `${-position.x * 2}px ${-position.y * 2}px`
      }]"
       ></div>
    <div class="middle" ref="target">
      <img :src="images[active]" alt="" />
      <!-- 移动得遮罩层 -->
      <div
        class="layer"
        :style="{left: position.x + 'px', top: position.y + 'px'}"
        v-show="!isOutside">
      </div>
    </div>
    <ul class="small">
      <!-- :class="{ active: item === 1 }" -->
      <li v-for="(item, index) in images" :class="{ active: index === active }" :key="item">
        <img @mouseenter="active = index" :src="item" alt="" />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }

  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;

    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0, 0, 0, .2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>